beautiful scene ,
for mirror’s you can use the 2d SceneCapture actor , with blueprints to get the reflected vector. which resembles the PlanarReflectionCaptureActor
https://forums.unrealengine.com/showthread.php?39212-mirror-material&p=332244&viewfull=1#post332244
video tutorial:
watch?v=Ux9VFZL_DcM